diff --git a/app/controllers/social_previews_controller.rb b/app/controllers/social_previews_controller.rb
index b7107f482..676290a6b 100644
--- a/app/controllers/social_previews_controller.rb
+++ b/app/controllers/social_previews_controller.rb
@@ -40,7 +40,7 @@ class SocialPreviewsController < ApplicationController
 
   def comment
     @comment = Comment.find(params[:id])
-    @tag_badges = Badge.where(id: Tag.where(name: @comment.commentable.decorate.cached_tag_list_array).pluck(:badge_id))
+    @tag_badges = Badge.where(id: Tag.where(name: @comment.commentable&.decorate&.cached_tag_list_array).pluck(:badge_id))
 
     set_respond
   end
diff --git a/app/views/social_previews/comment.html.erb b/app/views/social_previews/comment.html.erb
index 9fbee3f54..0460983ba 100644
--- a/app/views/social_previews/comment.html.erb
+++ b/app/views/social_previews/comment.html.erb
@@ -113,10 +113,10 @@
     <% elsif @comment.title.size < 50 %>
       <% font_size = 8.3 %>
     <% else %>
-      <% font_size = 15 - ((((@comment.title).size**0.92) + 85) / 16) %>
+      <% font_size = 15 - (((@comment.title.size**0.92) + 85) / 16) %>
     <% end %>
     <div class="title-area">
-      <h2>re: <%= @comment.commentable.title %></h2>
+      <h2>re: <%= @comment.commentable&.title %></h2>
       <h1 style="font-size:<%= font_size %>vw;"><%= @comment.title %></h1>
     </div>
     <div class="preview-user">